Stapling machine



June 13, 1944.

H. s. HELLER S TAPLING MACHINE Filed Deo. s, 1941 Fla-2 lNvENToR HAROLDS. HELLER BY/ M Patented June 13, 1944 U NITED STAT ES PAT ENT OFF"sTAPI'JNo- MACHINE Harold S. Heller, ClevelandHeights, Ohio ApplicationDecember 8, 1941, Serial N0. 422,077'.

5 Claims.

An object of the present-'invention is to provide and drive a fastenerhaving the characteristics of a brad. In theform of the-invention heredisclosed, a pair of these fasteners are cut from a standard U-shapestaple and driven simultaneously. The invention resides inthe-variousparts adapted for carrying outvthe invention, as will moreclearly appearl they accompanying drawing and description, and theessential features of the invention vwill be set forth in the claims.

In the drawing, Fig; :1 is -a side elevational View of a staplingmachine embodying -my invention; Fig. 2 is an enlarged fragmental viewof the lower right-handportion of Fig. l, the gate being in a loweredposition; 3 is a fragmental front elevationalA view. of the lowerright-hand portion of Fig. 1 taken in approximately the positionindicated at 3-`-3, Fig. l; Fig. 4 is a view similar to Fig. 3 withcertain parts broken away and in section so as to morevclearly -showtheconstruction; Fig. 4a isV a viewv similar to Fig. 4 and showing twobrad-like fastening elements as cut from a standardstaple andsimultaneously driven into a piece of molding for the securement thereofto a screen frame; Fig. 5 is abottom view of .the structure shown in 3;Fig. 6 is a plan view illustrating the; screen frame and molding of Fig.4a, the screen'moldin'g beingr secured by the usepf theApresentifastening elements; l.and Fig. 'Vis a 'vertical sectional viewon the line 1-1 of Fig. 6.

The staple machine here illustrated for the disclosure of the presentinvention is similar in many respects to the machine shown in UnitedStates Patent No. 1,996,640, granted April 2, 1935 to Francis M. Case.Therefore only a brief description will be given of the parts similar inthe two machines.

The upper part of the machine comprises a hollow casing I formed of amain frame and a cover frame and providing a hand grip at II and avertically extending square housing at I2 in which reciprocates aplunger I3 having a rubber cap I4 adapted to be struck in effectingdownward movement of the plunger. A spring, not shown, normally biasesthe plunger I3 to its uppermost position. The base of the machinecomprises a staple guide bar I of generally inverted T-form shape uponwhich slide the U-shape staples I6 which are usually connected as agroup by suitable adhesive which vpermits --thestaplea the staples so asto feed them to -thedriving position beneath a driving blade carried bythe plunger I3. This follower is pulled forwardly lby a spring enclosedin the housing I0 andfhaving one of its ends Aattached tothe followeratt-I8. When loading the machine with staples, the' follower is latchedin its rearmost position'and'aiiat spring I9 is provided to =hold thefollower in latched position. Atl the Vforwardv end of the guide bar aninverted'fU -shape frontk guide :20 is secured to the bar by pins orrivets 2|. The inner face of this guide 20, as bes-tseen in Fig. 4, isspaced from the end of bar I5, as indicated at 22; for the passage ofthestaples to'a posi-tion beneath the plunger driving blade. A front'gate 23 is pivotally-mounted--on a pin-24^ina slot :20a in the guide25, this -slot permitting A'the gate to be dro-pped to the positionshown in Fig. 2 for the purpose of sliding a group of staples onto 4thebar I5 from the ,front end thereof. After such a loading of the machinewith staples,v the gate is swung upwardly yto the position shown. in theother views, where it rests fon twoside ali-ps '20h of the ,guide 20 and:is 'held "by the `gate latch 25 which is reciprocably mounted in thebenteover guide portions Illa of the; housing I0.. A .tongue 23a struckup from the front vwallof Lthegate 23 provides a stop Which'l-imits the,downward movement of the gate 'latch 25. Thus the gate prevents thestaples I6 from being moved forwardly out of the machine] undertheQaction-.of Ithe spring-pressed follower t1.' Ali .of the :abnVS-.Cilescribed parts are like those shown in the above mentioned Casepatent, to which further reference may be had if desired.

In carrying out the present invention, in the stapling machine hereillustrated, an anvil 26, here shown as of inverted T-shape crosssection, is rigidly mounted, by means of the pins 2 I, in a slot in theforward end of the staple supporting bar I5, and projecting forwardlyfrom such bar y is an anvil lip 26a of generally rectangular crosssection.

Suitably secured to the plunger I3 for movement therewith, and lyingalong the front face thereof, is a driving blade 21. As shown in Figs. 4and 4a, the lower end of this plunger blade is centrally notched orrecessed, as at 28, for cooperation with the anvil lip 26a in shearingfrom each staple, during the driving thereof, the middle portion ISa ofthe staple crown, and in simultaneously driving into the Work the spacedstaple n portions 21a of the plunger blade 2l.

legs and the short crown end portions at the tops thereof. To that end,the side edge portions 21a of the lower end of the plunger blade are sospaced by the plunger blade notch or recess 2*'8 as to more or lesssnugly receive therebetween, as the plunger blade is depressed, theanvil lip 26a. VThus, during the driving of each staple, downwardmovement of the middle portion l6a of the staple crown is arrested bythe anvil lip 26a, with thepcnsequent removal of such staple crownportion, by shearing, as downward movement of the plunger blade 21continues. Before such shearing of the middle portion of the staple`crown occurs, the staple legs I6 are started in't'o the work, and as thedownward movement .of Vthe plunger blade continues, the two staple legs,each with a short end portion i6 of the staple crown at the-top thereof,are completely driven into the work by the correspondingly spaced sideedge During such shearing and driving operation, the plunger bladenrecess. ,2 8 receives the anvil lip 26a and the severed middle portion[6av ofJ the staple crown, -as will be evidentfrom FigAa.

Therefore, during each ldriving operation, two separate brad-likefastening elements are simultaneouvsly formed from each staple andsimul- Ataneously driven into thehworls, the headed portions` lffof saidfastening elements being imbedded in the worlgflush with vthe topsurface .thereof, ,if, desired, For purposes of illustration,

these. brad-like` fasteningelerrnents are here shown (see Figs. da,`@and A'1) for the securement -of amoldingstrip 28atoa screen frame 30,with the screen' 42,9 interposedV therebetween.V Pairs ofvthesegfastening*elementsmay be easily and rapidly. driveng into Hthe Vwork, lwith the Vfastening beingeectedrina neat and attractive manner..For .theoutwardpassage V,from the stapling V,machine of the severedmiddle portions `I liaY of the staple crowns, a suitable opening h isprovided Yin the front wall of the pivoted gate 23, as best Vshown inFig. 3. r,greater width than the anvilmlip 2da and hence of somewhat:greater width, than the severed, staple. crown portions, the width ofthe anvil lip Jdet'ermining, o,f,cour se the length of the staple Ccrown portions which: arev severed by shearing. Usually, the 1 severed.stapleV crown portions Y automaticallyleave the stapling machine throughthe gate* opening 23h, so lthatgno attention thereto --n'eed be` giveniny uselof the present stapling ma- This opening is 1of somewhat chine.Y Y,

-To those skilled inthe arttowhlch the present inventionrelates,.-"otherfeatures and advantages thereof will be evident from the foregoingdescription of one embodiment of such invention.

What I claim is:

1. In a stapling machine, means for holding a staple, said staple havinga top portion and two depending leg portions, means for driving said legportions, and means underlying and engaging at least a part of said topportion and coacting with said driving means for shearing away at leasta partofsaid top portion by operation of said driving means. v f i Q l2. In a staple driving machine, 'a vertically reciprocable plungerblade, means for feeding a staple beneath said plunger blade, saidstaple having a top portion and two depending leg portions, said plungerblade having two spaced portions adapted'v t'o overlie and drive saidstaple leg portions, and. a fixed anvil adapted to underlie and engagethat part of said staple top portion which Vis disposed betweensaidspaced plunger blade portions whereby to shear off such part of saidtop portionand to`d'rivI said separated leg portionsby movement of saidplunger blade.

3. In a staplingfmachine, means for holding a staple havings pacedllegvportions and a connecting portion therefor, a pair of cooperable meansfor severing said staple connectlngportion, and

Ameans for. producing relative; movement'between said cooperable'meansto sever such staple connecting portion andfor `continuing such movementto eiect the simultaneous driving of the separated staple `leg portionsinto staple-receiv- 4,separated staple leg portions intostaple-receiving material, vand means having an opening for thedischargefromz the stapling machine ofthe severed staple `connecting portion'.

5. yIn a stapling machinefmeansi for holding 'a staple, saidlgstaplehaving twnrspaced leg portions` and a 4crovifrl,portiontherebetween,means for drivingA said leg porti'ons, and means underlying andengaging'the middlevpart of said crown portion and coacting :with saiddriving means for shearing awaysaid middle part of said staple

